There were a number of Warrigton-Smythes involved in Helford.
Oddly enough I’ve just been reading about them. I happen to have a small publication by Landfall Publications entitled Operation Cornwall 1940-1944: The Fal, the Helford and D-Day
. It states part of the original SOE contingent on the Helford left in the autumn of 1942 to carry out similar activities on the coast of North Africa, the remainder placed at that time under the command of Lieut-Commander Bevil Warington-Smyth, with the SIS contingent under his brother Nigel. The SOE had been based in a beautiful house overlooking the estuary called Ridifarne, which I note from the internet still exists, and is available as a holiday let, while the SIS used a three-masted yacht belonging to Lord Runciman, called Sunbeam II